Salari-Moghaddam Asma, Nouri-Majd Saeedeh, Keshteli Ammar Hassanzadeh, Emami Fatemeh, Esmaillzadeh Ahmad, Adibi Peyman
Department of Biochemistry, School of Medicine, Ilam University of Medical Sciences, Ilam, Iran.
Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran.
Front Nutr. 2022 Apr 4;9:838752. doi: 10.3389/fnut.2022.838752. eCollection 2022.
Diet quality is a major contributor to human health. In addition, antioxidants have a great contribution to several chronic conditions. The purpose of this study was to evaluate if dietary total antioxidant capacity (TAC) can be considered as a measure of diet quality in a Middle Eastern country.
In this cross-sectional study on 6,724 Iranian adults, we used a validated food frequency questionnaire (FFQ) to assess dietary intakes. Data derived from the FFQ was used to calculate dietary TAC and well-known diet quality scores including alternate healthy eating index (AHEI) and dietary diversity score (DDS). Dietary TAC was calculated based on the ferric reducing-antioxidant power (FRAP) values reported in earlier publications. AHEI and DDS have also been constructed based on previous publications. Cross-classification was used to examine the agreement between these measures.
Mean age and BMI of study participants were 36.89 ± 8.08 y and 24.97 ± 3.87 kg/m, respectively. We found that individuals in the highest tertile of dietary TAC had higher scores of AHEI (57.53 ± 0.20 vs. 52.03 ± 0.20, < 0.001) and DDS (5.56 ± 0.03 vs. 4.15 ± 0.03, < 0.001) compared with those in the lowest tertile. Participants' distribution on the basis of the cross-classification analysis indicated that the classifications were in exact agreement for 42.6%, within an adjacent tertile for 33.05%, and in gross misclassification for 20% of individuals. When this was examined between dietary TAC and DDS, we found that exact agreement in the classifications was for 59.2% of participants. Notably, a very low proportion of gross misclassification was seen in this regard such that only 6% of participants were classified in the opposing tertiles, indicating additional support for a good agreement.
We found that dietary TAC might be considered as a proper measure for the assessment of diet quality because it was well correlated with well-known measures of diet quality including DDS and AHEI scores.
饮食质量是影响人类健康的主要因素。此外，抗氧化剂对多种慢性疾病有很大影响。本研究的目的是评估在一个中东国家，饮食总抗氧化能力（TAC）是否可被视为饮食质量的一项衡量指标。
在这项针对6724名伊朗成年人的横断面研究中，我们使用经过验证的食物频率问卷（FFQ）来评估饮食摄入量。从FFQ获得的数据用于计算饮食TAC以及知名的饮食质量评分，包括替代健康饮食指数（AHEI）和饮食多样性评分（DDS）。饮食TAC是根据早期出版物中报道的铁还原抗氧化能力（FRAP）值计算得出的。AHEI和DDS也是根据先前的出版物构建的。采用交叉分类法来检验这些指标之间的一致性。
研究参与者的平均年龄和体重指数分别为36.89±8.08岁和24.97±3.87kg/m²。我们发现，饮食TAC处于最高三分位数的个体，其AHEI得分（57.53±0.20对52.03±0.20，P<0.001）和DDS得分（5.56±0.03对4.15±0.03，P<0.001）均高于最低三分位数的个体。基于交叉分类分析的参与者分布表明，分类完全一致的个体占42.6%，相邻三分位数内的个体占33.05%，20%的个体存在严重错误分类。当在饮食TAC和DDS之间进行此项检验时，我们发现分类完全一致的参与者占59.2%。值得注意的是，在这方面严重错误分类的比例非常低，仅有6%的参与者被分到相反的三分位数中，这表明二者具有良好一致性的额外证据。
我们发现饮食TAC可能被视为评估饮食质量的一项合适指标，因为它与包括DDS和AHEI评分在内的知名饮食质量指标具有良好的相关性。
